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Alarm Limits 5-17
Managing Ethernet MicroLAN Switches
Figure 5-8. Port Alarm Limits Window
The Alarm Limits window displays the following Þelds:
Collisions
Use the text box in this Þeld to enter the number of collisions per good packet you
wish to allow on the selected repeater, board, or port before an alarm is generated;
allowable values are 1-15. For example, if you enter a value of 1, the alarm will be
generated if the repeater, board, or port experiences an average of one collision
per good packet received during the conÞgured time base (see the explanation for
Òwithin,Ó below). In terms of percentages, an alarm threshold value of 1 would
generate an alarm if 50% of your packets were collisions (one collision for every
good packet); a threshold value of 15 would generate an alarm if 93.75% of your
packets were collisions (15 collisions for every good packet). Therefore, the lower
you set your threshold value, the lower the percentage of collisions per good
packet you are allowing.
Remember, a repeater- or board-level alarm will calculate the number of collisions
per good packet based on all trafÞc received on the repeater channel; a port-level
alarm will make the calculation based on trafÞc on the speciÞc port only.